Data driving circuit and driving method thereof, data driving system and display device

ABSTRACT

The present disclosure provides a data driving circuit and a driving method thereof, a data driving system and a display device. In an embodiment of a data driving circuit, each digital to analog conversion unit is only used for driving sub-pixels of one color, and by controlling on-off of the switch unit, one data line interface unit is enabled to be connected to different digital to analog conversion units when driving sub-pixels of different colors. In this way, a reference voltage can be provided to the digital to analog conversion unit for driving different color display by a single physical Gamma circuit, without having to use a digital Gamma circuit. Therefore, gray scale loss caused by adjustment using the digital Gamma circuit can be avoided fundamentally.

FIELD

The present disclosure relates to the field of display technology,particularly to a data driving circuit and a driving method thereof, adata driving system and a display device.

BACKGROUND

In the conventional pixel arrangement manner, any output channel of thedata driving circuit corresponds to a fixed color. As shown in FIG. 1,the colors of sub-pixels (sub-pixels of column Rm, m is a positiveinteger) connected by each data line Dm are the same (all are R, all areB or all are G). These output channels are fixedly connected to adigital to analog converter (DAC) of a corresponding color; the digitalto analog converter is then connected to a Gamma circuit to which thiscolor corresponds. In this way, different colors would not be mutuallyinfluenced.

In displays of Sub Pixel Rendering (SPR) type, one data line isgenerally connected to sub-pixels of different colors. FIG. 2 shows apossible way of SPR sub-pixel arrangement manner, wherein sub-pixels ofcolumn Rm (m=1, 2, 3 . . . ) connected by any data line Dm (m=1, 2, 3 .. . ) contain sub-pixels of three colors (R, G, B). If the Gammacircuits grouped according to colors are still used, it will result inabnormity of the output voltage value. A commonly used solution atpresent is combining the Gamma input voltages of various colors suchthat there is only one group of Gamma circuits within the whole chip.Here all the DACs are connected to the same group of Gamma circuits, andperform gray scale operations on the data in the forepart such that theinput gray scales of various colors correspond to different voltagevalues. This is generally called digital Gamma adjustment. Such a methodmay result in gray scale loss, because not all the gray scales can bedisplayed for colors of small voltage ranges; moreover, the displayquality of the screen is thus declined.

SUMMARY

An object of the present disclosure lies in providing a data drivingmechanism which can mitigate or avoid gray scale loss.

In a first aspect, a data driving circuit comprising a plurality ofsub-circuits is provided. Each sub-circuit comprises: a plurality ofdigital to analog conversion units, each digital to analog conversionunit being used for only driving sub-pixels of one color; a plurality ofdata line interface units, each data line interface unit being connectedto one data line; and a plurality of switch units, connected between theplurality of digital to analog conversion units and the plurality ofdata line interface units, and configured to turn on or off under thecontrol of control signals, so as to enable each of the plurality ofdata line interface units to be connected to different digital to analogconversion units when driving sub-pixels of different colors.

In an implementation, each data line interface unit comprises anoperational amplifier module.

In an implementation, each sub-circuit comprises N adjacent digital toanalog conversion units, N adjacent data line interface units and aplurality of switch units connected to the N adjacent digital to analogconversion units and the N adjacent data line interface units, wherein Nis a number of types of colors of the sub-pixels.

In an implementation, each digital to analog conversion unit isconnected to N adjacent data line interface units via N switch units,and each data line interface unit is connected to N adjacent digital toanalog conversion units via N switch units.

In an implementation, the value of N is 3. In each sub-circuit: a firstdata line interface unit is connected to a first digital to analogconversion unit through a first switch unit, and is connected to asecond digital to analog conversion unit through a second switch unit; asecond data line interface unit is connected to a second digital toanalog conversion unit through a third switch unit, and is connected toa third digital to analog conversion unit through a fourth switch unit;and a third data line interface unit is connected to the third digitalto analog conversion unit through a fifth switch unit, and is connectedto the first digital to analog conversion unit through a sixth switchunit.

In an implementation, the data driving circuit comprises two switch unitcontrol interfaces for receiving the control signals. Each switch unitis configured to turn on or off in response to levels applied to the twoswitch unit control interfaces, so that each of the plurality of dataline interface units is connected to different digital to analogconversion units when driving sub-pixels of different colors.

In another aspect, a data driving system is provided, comprising thedata driving circuit as stated above.

In an implementation, the data driving system further comprises a timingcontroller. The timing controller is connected with the data drivingcircuit for providing the control signals, so that each of the pluralityof data line interface units is connected to different digital to analogconversion units when driving sub-pixels of different colors.

In an implementation, the data driving circuit comprises two switch unitcontrol interfaces. The control signal is used for controlling levelstates of the two switch unit control interfaces.

In an implementation, the data driving system further comprises N Gammacircuits, wherein N is a number of types of colors of the sub-pixels.Respective digital to analog conversion units driving sub-pixels of thesame color are connected to the same Gamma circuit.

In yet another aspect, a display device is provided, comprising the datadriving system as stated above.

In an implementation, each digital to analog conversion unit in the datadriving circuit is connected to two data line interface units via twoswitch units, and each data line interface units are connected to twodigital to analog conversion units via two switch units. The displaydevice further comprises a pixel array, the pixel array comprising aplurality of sub-pixel arrays, each sub-pixel array comprising threecolumns of sub-pixels and three data lines, wherein in each sub-pixelarray, a sub-pixel of the 4x+1th row and a sub-pixel of the 4x+3th rowof sub-pixels of a first column, a sub-pixel of the 4x+2th row ofsub-pixels of a second column, a sub-pixel of the 4x+4th row ofsub-pixels of a third column are sub-pixels of a first color; asub-pixel of the 4x+4th row of sub-pixels of the first column, asub-pixel of the 4x+1th row and a sub-pixel of the 4x+3th row ofsub-pixels of the second column, a sub-pixel of the 4x+2th row ofsub-pixels of the third column are sub-pixels of a second color; andother sub-pixels are sub-pixels of a third color, wherein x is aninteger greater than or equal to 0, and wherein a first data line isconnected to the sub-pixels of the first color in the sub-pixels of thefirst column and the sub-pixels of the second color in the sub-pixels ofthe third column in another adjacent sub-pixel array, a second data lineis connected to the sub-pixels of the second color in the sub-pixels ofthe second column and the sub-pixels of the second color and sub-pixelsof the third color in the sub-pixels of the first column, and a thirddata line is connected to the sub-pixels of the third color in thesub-pixels of the third column and the sub-pixels of the first color andthe sub-pixels of the third color in the sub-pixels of the secondcolumn.

In yet another aspect, a method for driving the data driving circuit asstated above is provided, comprising: providing the control signals tothe data driving circuit, so that each of the plurality of data lineinterface units is connected to different digital to analog conversionunits when driving sub-pixels of different colors.

According to embodiments of the present disclosure, by controllingon-off of the switch unit, one data line interface unit is enabled to beconnected to different digital to analog conversion units when drivingsub-pixels of different colors, and each digital to analog conversionunit is used for only driving sub-pixels of one color. In this way, areference voltage can be provided to the digital to analog conversionunit for driving different color display by a single physical Gammacircuit, without having to use a digital Gamma circuit. Therefore, grayscale loss caused by adjustment using the digital Gamma circuit can beavoided fundamentally.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a conventional pixel array;

FIG. 2 is a schematic view of a pixel array of a SPR type;

FIG. 3 is a structural schematic view of a data driving circuitaccording to an embodiment of the present disclosure;

FIG. 4 is a schematic view of another pixel array that can be driven bya data driving circuit according to an embodiment of the presentdisclosure;

FIG. 5 is a structural schematic view of a data driving circuitaccording to another embodiment of the present disclosure;

FIG. 6 is a schematic view of a data driving system according to anembodiment of the present disclosure; and

FIG. 7 is a schematic view of a display device according to anembodiment of the present disclosure.

DETAILED DESCRIPTION

In order to enable the purposes, technical solutions and advantages ofembodiments of the present disclosure to be clearer, next, theembodiments of the present disclosure will be described clearly andcompletely with reference to the drawings. Apparently, the embodimentsto be described are only a part of rather than all of the embodiments ofthe present disclosure. Based on the embodiments of the presentdisclosure, all other embodiments obtained by the ordinary skilledperson in the art on the premise of not paying any creative work belongto the claimed scope of the present disclosure.

FIG. 2 shows a SPR sub-pixel arrangement manner, wherein sub-pixels ofcolumn Rm (m=1, 2, 3 . . . ) connected by any data line Dm (m=1, 2, 3 .. . ) contain sub-pixels of three colors (R, G, B).

FIG. 3 shows a data driving circuit 100 according to an embodiment ofthe present disclosure, which can be used for driving the pixel array asshown in FIG. 2. As shown in FIG. 3, the data driving circuit 100 cancomprise a plurality of sub-circuits (as an example, only three of themare shown and marked as C10, C20, C30). In this example, eachsub-circuit comprises three data line interface units 11, 12 and 13,three digital to analog conversion units 21, 22 and 23, and nine switchunits 31, 32, 33 . . . 39. In each sub-circuit, each data line interfaceunit 11, 12 and 13 is connected to the three digital to analogconversion units 21, 22 and 23 in the sub-circuit through the threeswitch units in the sub-circuit respectively, and each digital to analogconversion unit 21, 22 and 23 is also connected to the three data lineinterface units 11, 12 and 13 in the sub-circuit through the threeswitch units in the sub-circuit respectively. Specifically, the dataline interface unit 11 is connected to the digital to analog conversionunit 21 through the switch unit 31, is connected to the digital toanalog conversion unit 22 through the switch unit 34, and is connectedto the digital to analog conversion unit 23 through the switch unit 35;the data line interface unit 12 is connected to the digital to analogconversion unit 21 through the switch unit 32, is connected to thedigital to analog conversion unit 22 through the switch unit 36, and isconnected to the digital to analog conversion unit 23 through the switchunit 38; and the data line interface unit 13 is connected to the digitalto analog conversion unit 21 through the switch unit 33, is connected tothe digital to analog conversion unit 22 through the switch unit 37, andis connected to the digital to analog conversion unit 23 through theswitch unit 39.

The data line interface units 11, 12 and 13 here can be interfaces orinterface components for accessing to data lines. In an implementation,each of the data line interface units 11, 12 and 13 can comprise anoperational amplifier module OPA. The operational amplifier module OPAcan amplify the data voltage outputted by the digital to analogconversion unit and output it to a corresponding data line.

When the data driving circuit 100 as shown in FIG. 3 is driven, theoperations of respective groups of sub-circuits can be identical. Next,the driving process of the sub-circuit C10 will be explained withreference to FIGS. 2 and 3.

When the sub-pixels of row S1 are scanned, the switch unit 31 betweenthe digital to analog conversion unit 21 and the data line interfaceunit 11 is turned on, and other switch units (switch units 32, 33)connected by the digital to analog conversion unit 21 and other switchunits (switch units 34, 35) connected by the data line interface unit 11are turned off, thereby connecting the data line interface unit 11 tothe digital to analog conversion unit 21. According to the same manner,the data line interface unit 12 is connected to the digital to analogconversion unit 22, and the data line interface unit 13 is connected tothe digital to analog conversion unit 23. In this way, the bluesub-pixel of row S1 and column R1 as shown in FIG. 2 is accessed to thedigital to analog conversion unit 21, the red sub-pixel of row S1 andcolumn R2 is accessed to the digital to analog conversion unit 22, andthe green sub-pixel of row S1 and column R3 is accessed to the digitalto analog conversion unit 23.

When the sub-pixels of row S2 are scanned, by controlling on-off of therespective switch units, the data line interface unit 13 is connected tothe digital to analog conversion unit 22, the data line interface unit11 is connected to the digital to analog conversion unit 23, and thedata line interface unit 12 is connected to the digital to analogconversion unit 21. In this way, the blue sub-pixel B of row S2 andcolumn R2 as shown in FIG. 2 is accessed to the digital to analogconversion unit 21, the red sub-pixel of row S2 and column R3 isaccessed to the digital to analog conversion unit 22, and the greensub-pixel of row S2 and column R1 is accessed to the digital to analogconversion unit 23.

When the sub-pixels of row S3 are scanned, by controlling on-off of therespective switch units, the data line interface unit 11 is connected tothe digital to analog conversion unit 21, the data line interface unit12 is connected to the digital to analog conversion unit 22, and thedata line interface unit 13 is connected to the digital to analogconversion unit 23. In this way, the blue sub-pixel of row S3 and columnR1 as shown in FIG. 2 is accessed to the digital to analog conversionunit 21, the red sub-pixel of row S3 and column R2 is accessed to thedigital to analog conversion unit 22, and the green sub-pixel of row S3and column R3 is accessed to the digital to analog conversion unit 23.

When the sub-pixels of row S4 are scanned, by controlling on-off of therespective switch units, the data line interface unit 11 is connected tothe digital to analog conversion unit 22, the data line interface unit12 is connected to the digital to analog conversion unit 23, and thedata line interface unit 13 is connected to the digital to analogconversion unit 21. In this way, the blue sub-pixel of row S4 and columnR3 as shown in FIG. 2 is accessed to the digital to analog conversionunit 21, the red sub-pixel of row S4 and column R1 is accessed to thedigital to analog conversion unit 22, and the green sub-pixel of row S4and column R2 is accessed to the digital to analog conversion unit 23.

The driving process of the sub-pixels of rows S5-S8 can be identicalwith the driving process of the sub-pixels of rows S1-S4, which will notbe repeated here.

In the above driving process of the data driving circuit 100, forrespective columns of sub-pixels driven by one sub-circuit, all bluesub-pixels B are accessed to the digital to analog conversion unit 21,all red sub-pixels R are accessed to the digital to analog conversionunit 22, and all green sub-pixels G are accessed to the digital toanalog conversion unit 23. In actual applications, it only needs toconnect the digital to analog conversion unit 21 to a physical Gammacircuit for driving the blue sub-pixels, connect the digital to analogconversion unit 22 to a physical Gamma circuit for driving the redsub-pixels, and connect the digital to analog conversion unit 23 to aphysical Gamma circuit for driving the green sub-pixels. Since there isno need to use the digital Gamma circuit, gray scale loss caused byadjustment using the digital Gamma circuit can be avoided fundamentally.

It should be noted that for pixel arrays arranged in different manners,the specific connecting manners of respective switch units in the datadriving circuit according to the embodiment of the present disclosuremay not be all the same without deviating from the spirit and the scopeof the present disclosure. FIG. 4 is another pixel array, which can alsobe driven by the data driving circuit according to an embodiment of thepresent disclosure. As shown in FIG. 4, the pixel array comprises aplurality of sub-pixel arrays AU, each of which comprises three columnsof sub-pixels and three data lines. Take a sub-pixel array AU containingR4, R5 and R6 columns of sub-pixels and D4, D5 and D6 data lines as anexample, a sub-pixel of the 4x+1th (x is an integer greater than orequal to 0) row and a sub-pixel of the 4x+3th row of sub-pixels of afirst column R4, a sub-pixel of the 4x+2th row of sub-pixels of a secondcolumn R5, a sub-pixel of the 4x+4th row of sub-pixels of a third columnR6 are blue sub-pixels B; a sub-pixel of the 4x+4th row of sub-pixels ofthe first column R4, a sub-pixel of the 4x+1th row and a sub-pixel ofthe 4x+3th row of sub-pixels of the second column R5, a sub-pixel of the4x+2th row of sub-pixels of the third column R6 are red sub-pixels R;other sub-pixels are green sub-pixels G. The first data line D4 isconnected to the blue sub-pixels B in the sub-pixels of column R4 andthe red sub-pixels R in the sub-pixels of column R3 in another adjacentsub-pixel array, the second data line D5 is connected to the redsub-pixels R in the sub-pixels of column R5 and the red sub-pixels R andthe green sub-pixels G in the sub-pixels of column R4, and the thirddata line D6 is connected to the green sub-pixels G in the sub-pixels ofcolumn R6 and the blue sub-pixels B and the green sub-pixels G in thesub-pixels of column R5.

FIG. 5 shows a data driving circuit 200 according to an embodiment ofthe present disclosure for driving the pixel array as shown in FIG. 4.What differs from the data driving circuit 100 provided by the precedingembodiment is that each sub-circuit of the data driving circuit 200 onlycomprises six switch units 31, 32, 33, 34, 35, 36. The data lineinterface unit 11 is connected to the digital to analog conversion unit21 through the switch unit 31, and is connected to the digital to analogconversion unit 22 through the switch unit 32; the data line interfaceunit 12 is connected to the digital to analog conversion unit 22 throughthe switch unit 33, and is connected to the digital to analog conversionunit 23 through the switch unit 34; the data line interface unit 13 isconnected to the digital to analog conversion unit 23 through the switchunit 35, and is connected to the digital to analog conversion unit 21through the switch unit 36. As stated above, each of the data lineinterface units 11, 12 and 13 can also comprise an operational amplifiermodule OPA (not shown).

When the data driving circuit 200 is driven, the operations ofrespective sub-circuits can be identical. Next, the driving process ofthe sub-circuit C20 will be explained with reference to FIGS. 4 and 5.

When the sub-pixels of row S1 are scanned, by controlling on-off of therespective switch units, the data line interface unit 11 is connected tothe digital to analog conversion unit 21, the data line interface unit12 is connected to the digital to analog conversion unit 22, and thedata line interface unit 13 is connected to the digital to analogconversion unit 23. In this way, the blue sub-pixel of row S1 and columnR4 is accessed to the digital to analog conversion unit 21, the redsub-pixel of row S1 and column R5 is accessed to the digital to analogconversion unit 22, and the green sub-pixel of row S1 and column R6 isaccessed to the digital to analog conversion unit 23.

When the sub-pixels of row S2 are scanned, by controlling on-off of therespective switch units, the data line interface unit 13 is connected tothe digital to analog conversion unit 21, the data line interface unit11 is connected to the digital to analog conversion unit 22, and thedata line interface unit 12 is connected to the digital to analogconversion unit 23. In this way, the red sub-pixel of row S2 and columnR3 is accessed to the digital to analog conversion unit 22, the greensub-pixel of row S2 and column R4 is accessed to the digital to analogconversion unit 23, and the blue sub-pixel of row S2 and column R5 isaccessed to the digital to analog conversion unit 21.

When the sub-pixels of row S3 are scanned, by controlling on-off of therespective switch units, the data line interface unit 11 is connected tothe digital to analog conversion unit 21, the data line interface unit12 is connected to the digital to analog conversion unit 22, and thedata line interface unit 13 is connected to the digital to analogconversion unit 23. In this way, the blue sub-pixel of row S3 and columnR4 is accessed to the digital to analog conversion unit 21 the redsub-pixel of row S3 and column R5 is accessed to the digital to analogconversion unit 22, and the green sub-pixel of row S3 and column R6 isaccessed to the digital to analog conversion unit 23.

When the sub-pixels of row S4 are scanned, by controlling on-off of therespective switch units, the data line interface unit 11 is connected tothe digital to analog conversion unit 21, the data line interface unit12 is connected to the digital to analog conversion unit 22, and thedata line interface unit 13 is connected to the digital to analogconversion unit 23. In this way, the red sub-pixel of row S4 and columnR3 is accessed to the digital to analog conversion unit 22, the greensub-pixel of row S4 and column R4 is accessed to the digital to analogconversion unit 23, and the blue sub-pixel of row S4 and column R5 isaccessed to the digital to analog conversion unit 21.

The driving process of the sub-pixels of rows S5-S8 can be identicalwith the driving process of the sub-pixels of rows S1-S4, which will notbe repeated here.

In the above driving process of the data driving circuit 200, forrespective columns of sub-pixels driven by one sub-circuit, all bluesub-pixels B are accessed to the digital to analog conversion unit 21,all red sub-pixels R are accessed to the digital to analog conversionunit 22, and all green sub-pixels G are accessed to the digital toanalog conversion unit 23. In actual applications, it only needs toconnect the digital to analog conversion unit 21 to a physical Gammacircuit for driving the blue sub-pixels, connect the digital to analogconversion unit 22 to a physical Gamma circuit for driving the redsub-pixels, and connect the digital to analog conversion unit 23 to aphysical Gamma circuit for driving the green sub-pixels. Since there isno need to use the digital Gamma circuit, gray scale loss caused byadjustment using the digital Gamma circuit can be avoided fundamentally.

It can be seen that the data driving circuits 100, 200 according to theembodiments of the present disclosure can use a single physical Gammacircuit to drive a pixel array in which one data line is connected tosub-pixels of a plurality of different colors, so as to avoid gray scaleloss caused by adjustment using digital Gamma circuits.

It should be understood that although the above embodiments areexplained with respect to the number N of types of the colors of thesub-pixels is three (red, green, blue), in actual application, thecolors of the sub-pixels can also be four or more. In such a case, onedigital to analog conversion unit can still be connected to N data lineinterface units through N switch units, and one data line interface unitcan be connected to N digital to analog conversion units through Nswitch units. Each data line interface unit can, when driving sub-pixelsof a particular color, be connected to a digital to analog conversionunit to which the particular color corresponds. Such a technicalsolution still falls within the scope of the present disclosure.

In addition, in the above embodiments, the arrangement manner of thesub-pixels of the Zth row and the sub-pixels of the Z+4Yth (Z, Y areboth integers) row and the connection relationship with the data linesare completely the same, as shown in FIGS. 2 and 4. That is to say, thepixel array is arranged by taking four rows of sub-pixels as a period.In such a case, switching states of all switch units can have fourcombinations, corresponding to four rows of sub-pixels in one period. Asshown in FIGS. 3 and 5, the data driving circuits 100, 200 can comprisetwo switch unit control interfaces 41 and 42 for receiving controlsignals. The level states of the two switch unit control interfaces 41and 42 have four combinations totally (00, 01, 10, 11, wherein 1 canrepresent a high level), corresponding to four switching states of theswitch unit. In this way, four different switch connection states can berealized by controlling the level states of the switch unit controlinterfaces 41 and 42 using control signals. Here, the respective switchunits can be configured to turn on or off in response to levels appliedto the two switch unit control interfaces 41 and 42, so that one dataline interface unit is connected to different digital to analogconversion units when driving sub-pixels of different colors.

For different sub-pixel arrangements, there are generally no more thanfour types of sub-pixel rows. Hence, corresponding control can berealized by four or less switch state combinations. Certainly, whenthere are more than four switch state combinations being required, morethan two switch unit control interfaces can be used.

FIG. 6 shows a data driving system 600 according to an embodiment of thepresent disclosure. The data driving system 600 comprises the above datadriving circuit 100/200. Further, the data driving system 600 canfurther comprise a timing controller 610. The timing controller 610 isused for providing control signals to the data driving circuit 100/200so as to control on-off of each switch unit, so that one data lineinterface unit is connected to different digital to analog conversionunits when driving sub-pixels of different colors. In an example wherethe data driving circuit comprises two switch unit control interfaces,the timing controller 610 can control on-off of respective switch unitsby controlling the level states of the two switch unit controlinterfaces.

As shown in FIG. 6, the data driving system 600 can also comprise NGamma circuits Gamma_1, Gamma_2 . . . Gamma_N. The digital to analogconversion units driving sub-pixels of the same color are connected tothe same Gamma circuit, while the digital to analog conversion unitsdriving sub-pixels of different colors are connected to different Gammacircuits. Here N is a number of types of colors of the sub-pixels usedby color display.

FIG. 7 shows a display device 700 according to an embodiment of thepresent disclosure. The display device 700 comprises the above datadriving system 600. In one implementation, the display device 700 canfurther comprise a pixel array 710. The pixel array 710 can be the pixelarray as shown in FIG. 4, and will not be repeated here. Here, the datadriving circuit comprised in the data driving system 600 is the datadriving circuit 200 as shown in FIG. 5. In actual applications, thedisplay device 700 can be any product or component having a displayfunction such as electronic paper, a mobile phone, a tablet computer, atelevision, a display, a laptop, a digital photo frame, a navigator etc.

In another aspect of the present disclosure, a method for driving theabove data driving circuit is also provided, comprising: providing thecontrol signals to the data driving circuit, so that each of theplurality of data line interface units is connected to different digitalto analog conversion units when driving sub-pixels of different colors.

What is stated above are only specific embodiments of the presentdisclosure; however, the claimed scope of the present disclosure is notlimited to this. Any modifications or replacements that can be easilyconceived by the skilled person familiar with the present technicalfield on the basis of the specific embodiments disclosed should becovered within the claimed scope of the present disclosure. Therefore,the claimed scope of the present disclosure is only defined by theclaims attached.

1. A data driving circuit, comprising a plurality of sub-circuits, each sub-circuit comprising: a plurality of digital to analog conversion units, each digital to analog conversion unit being used for only driving sub-pixels of one color; a plurality of data line interface units, each data line interface unit being connected to one data line; and a plurality of switch units, connected between the plurality of digital to analog conversion units and the plurality of data line interface units, and configured to turn on or off under the control of control signals, so as to enable each of the plurality of data line interface units to be connected to different digital to analog conversion units when driving sub-pixels of different colors.
 2. The data driving circuit as claimed in claim 1, wherein each data line interface unit comprises an operational amplifier module.
 3. The data driving circuit as claimed in claim 1, wherein each sub-circuit comprises N adjacent digital to analog conversion units, N adjacent data line interface units and a plurality of switch units connected to the N adjacent digital to analog conversion units and the N adjacent data line interface units, wherein N is a number of types of colors of the sub-pixels.
 4. The data driving circuit as claimed in claim 3, wherein each digital to analog conversion unit is connected to the N adjacent data line interface units via N switch units, and each data line interface unit is connected to the N adjacent digital to analog conversion units via the N switch units.
 5. The data driving circuit as claimed in claim 3, wherein a value of N is 3, and wherein in each sub-circuit: a first data line interface unit is connected to a first digital to analog conversion unit through a first switch unit, and is connected to a second digital to analog conversion unit through a second switch unit; a second data line interface unit is connected to a second digital to analog conversion unit through a third switch unit, and is connected to a third digital to analog conversion unit through a fourth switch unit; and a third data line interface unit is connected to a third digital to analog conversion unit through a fifth switch unit, and is connected to a first digital to analog conversion unit through a sixth switch unit.
 6. The data driving circuit as claimed in claim 1, wherein the data driving circuit comprises two switch unit control interfaces for receiving the control signals, and wherein each switch unit is configured to turn on or off in response to levels applied to the two switch unit control interfaces, so that each of the plurality of data line interface units is connected to different digital to analog conversion units when driving sub-pixels of different colors.
 7. A data driving system, comprising a data driving circuit as claimed in claim
 1. 8. The system as claimed in claim 7, further comprising a timing controller connected with the data driving circuit for providing the control signals, so that each of the plurality of data line interface units is connected to different digital to analog conversion units when driving sub-pixels of different colors.
 9. The system as claimed in claim 8, wherein the data driving circuit comprises two switch unit control interfaces for receiving the control signals, and wherein each switch unit is configured to turn on or off in response to levels applied to the two switch unit control interfaces, so that each of the plurality of data line interface units is connected to different digital to analog conversion units when driving sub-pixels of different colors, and wherein the control signals are used for controlling level states of the two switch unit control interfaces.
 10. The system as claimed in claim 7, further comprising N Gamma circuits, wherein N is a number of types of colors of the sub-pixels, wherein respective digital to analog conversion units driving sub-pixels of the same color are connected to the same Gamma circuit.
 11. A display device, comprising a data driving system as claimed in claim
 7. 12. The display device as claimed in claim 11, wherein each sub-circuit comprises N adjacent digital to analog conversion units, N adjacent data line interface units and a plurality of switch units connected to the N adjacent digital to analog conversion units and the N adjacent data line interface units, wherein N is a number of types of colors of the sub-pixels and wherein a value of N is 3, and wherein in each sub-circuit: a first data line interface unit is connected to a first digital to analog conversion unit through a first switch unit, and is connected to a second digital to analog conversion unit through a second switch unit; a second data line interface unit is connected to a second digital to analog conversion unit through a third switch unit, and is connected to a third digital to analog conversion unit through a fourth switch unit; and a third data line interface unit is connected to a third digital to analog conversion unit through a fifth switch unit, and is connected to a first digital to analog conversion unit through a sixth switch unit, and wherein the display device further comprises a pixel array, the pixel array comprising a plurality of sub-pixel arrays, each sub-pixel array comprising three columns of sub-pixels and three data lines, wherein in each sub-pixel array, a sub-pixel of the 4x+1th row and a sub-pixel of the 4x+3th row of sub-pixels of a first column, a sub-pixel of the 4x+2th row of sub-pixels of a second column, a sub-pixel of the 4x+4th row of sub-pixels of a third column are sub-pixels of a first color; a sub-pixel of the 4x+4th row of sub-pixels of the first column, a sub-pixel of the 4x+1th row and a sub-pixel of the 4x+3th row of sub-pixels of the second column, a sub-pixel of the 4x+2th row of sub-pixels of the third column are sub-pixels of a second color; and other sub-pixels are sub-pixels of a third color, wherein x is an integer greater than or equal to 0, and wherein a first data line is connected to the sub-pixels of the first color in the sub-pixels of the first column and the sub-pixels of the second color in the sub-pixels of the third column in another adjacent sub-pixel array, a second data line is connected to the sub-pixels of the second color in the sub-pixels of the second column and the sub-pixels of the second color and sub-pixels of the third color in the sub-pixels of the first column, and a third data line is connected to the sub-pixels of the third color in the sub-pixels of the third column and the sub-pixels of the first color and the sub-pixels of the third color in the sub-pixels of the second column.
 13. A method for driving a data driving circuit as claimed in claim 1, comprising: providing the control signals to the data driving circuit, so that each of the plurality of data line interface units is connected to different digital to analog conversion units when driving sub-pixels of different colors.
 14. A data driving system, comprising a data driving circuit as claimed in claim
 2. 15. A data driving system, comprising a data driving circuit as claimed in claim
 3. 16. A data driving system, comprising a data driving circuit as claimed in claim
 4. 17. A data driving system, comprising a data driving circuit as claimed in claim
 5. 18. A data driving system, comprising a data driving circuit as claimed in claim
 6. 19. A display device, comprising a data driving system as claimed in claim
 8. 20. A display device, comprising a data driving system as claimed in claim
 10. 